Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cbb012200ea141…

MALICIOUS

PDF

29.6 KB Authoring application: Pdftk
MD5: bcbc7fbc54ec644a9e47d1693d9dca2b SHA-1: aa4ebf9f2176fd9c0119727b341f727a2881231a SHA-256: 65cbb012200ea141f9dfc34a89d9108ee0f8dabcf26b64c43bd12d7d2a4eb2e4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO poisoning or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://friendsweatherapp.com/uploads/1/3/0/2/130292148/3e1bb5e.pdf
    • http://sophiecharlottephotography.com/uploads/1/3/0/2/130270849/golati.pdf
    • http://rustykettle.com/uploads/1/3/0/5/130550993/4791172.pdf
    • http://jub.migraskop.net/uploads/2020/01/29/kugofanobaxakakej.pdf
    • http://mval.org/uploads/1/3/0/6/130603884/6210621.pdf
    • http://parleyyouthfc.co.uk/uploads/1/3/0/5/130589205/ffa6dedc.pdf
    • http://pameladirnberger.com/uploads/1/3/0/6/130620406/130620406.html#acid+base+titration+curves+worksheet

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010c1.bin
cb3e98e10d222179e978ed8064e8219cfed73e1e2b5229e32992643f7b906fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1 8036 bytes

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